This move is new. There are many ways for Black to play and possibly 8...c6 is the most accurate, since there's no clear use for the h-pawn advance at the moment.
6. d2d3  6... e8g8  7. c2c4 White's system is harmless for an elite classical game, but in rapid a normal position is enough to fight for a win. 7... a7a5  8. b1c3 